Patents by Inventor Shigekatsu Takahashi

Shigekatsu Takahashi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 5062046
    Abstract: A multiple processor system composed of a plurality of instruction processors allows a plurality of its subsystems for performing data processing in each unit to be operable simultaneously with and parallel to each other in each of the instruction processors. The multiple processor system has a processor designation table and a control processing subsystem. As the processor designation table specifies correspondence relation between a subsystem accessing to each input-output resource and the instruction processor executing the subsystem, the processing control subsystem transfers control of the processing to the instruction processor to be designated by the processor designation table in accordance with the subsystem to be used with reference to the processor designation table during execution of the data processing.
    Type: Grant
    Filed: March 20, 1990
    Date of Patent: October 29, 1991
    Assignee: Hitachi, Ltd.
    Inventors: Takashi Sumiyoshi, Shigekatsu Takahashi, Shoji Yamamoto, Kazuyoshi Negishi, Masaaki Iwasaki
  • Patent number: 4434464
    Abstract: In a memory protection system for a computer, memory protection information provided for each of the memory areas of a memory and memory protection information provided for each of the programs executed by a processor are collated to determine allowance/inhibition of access to the memory. By detecting that an instruction to be executed is an instruction having a particular operation and that an address of the memory to be accessed by the instruction is a particular address, the memory protection information for the program executed by the processor is alterd to allow the memory access. The alteration of memory protection information is carried out with no intervention of a control program.
    Type: Grant
    Filed: March 31, 1981
    Date of Patent: February 28, 1984
    Assignee: Hitachi, Ltd.
    Inventors: Hitoshi Suzuki, Shigekatsu Takahashi, Yoshiki Fujioka